An SKR-4 recovery vehicle is sent by the Euro-Space Tracker Station to destroy a live rocket, containing a malfunctioning destruct system, but ends being blown out of orbit and completely destroyed, when it collides with a considerably large meteorite.

Re-produced and controlled by the Mysterons, it becomes the bombing weapon, which will accomplish the forces' newest target: the Najama Complex, a vital colossal desalination plant, situated by the foothills of the Andes mountains. Its purpose is to process seawater from the Pacific Ocean, and irrigate the interior, and without it, hundreds of square miles would regress to waste land.

The complex is automated and requires very few personnel to administer the process, however it consists of vulnerable tanks, each containing liquid oxygen which would turn the whole valley into a ""blazing inferno"" if attacked with strong force.

While the complex personnel are evacuated, Captains Scarlet, Blue, Magenta and Ochre are sent to set-up surveillan